Magnetic properties of barium hexaferrite powders

El‐Hilo, M.; Pfeiffer, H. P.; O'Grady, K.; Schüppel, W.; Sinn, Ekkehard; Görnert, P.; Rösler, Michael; Dickson, D.P.E.; Chantrell, R.W.

doi:10.1016/0304-8853(94)90130-9

Cited by 41 publications

(17 citation statements)

References 15 publications

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“…Concerning particle clusters, such as, for example, quasispherical aggregates, the overall configuration favors demagnetization. [20][21][22][23] According to Eq. ͑3͒, ͉dm d /dH͉ϭ2dm r /dH.…”

Section: Magnetic Characterizationmentioning

confidence: 99%

“…We note that the cell parameters of the hexagonal unit cell of BaFe 12 That degree of preferential orientation is a consequence of the diameter of the (001) face being much larger than the platelet thickness. Interactions were expected to be magnetizing among particles within the same stack 20,22,23 and demagnetizing among the stacks and within particle clusters. [21][22][23] Both types of interactions are always present in barium ferrites but one is dominant.…”

Section: Introductionmentioning

confidence: 99%

“…Interactions were expected to be magnetizing among particles within the same stack 20,22,23 and demagnetizing among the stacks and within particle clusters. [21][22][23] Both types of interactions are always present in barium ferrites but one is dominant.…”

Section: Introductionmentioning

confidence: 99%

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Interaction effects and energy barrier distribution on the magnetic relaxation of nanocrystalline hexagonal ferrites

1997

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The static and dynamic magnetic properties of nanocrystalline BaFe 10.4 Co 0.8 Ti 0.8 O 19 M -type doped barium ferrite were studied in detail to clarify the effect of interactions on the magnetic relaxation of an assembly of small particles. The logarithmic approximation was unable to account for the magnetic relaxation of the sample. Interaction effects were analyzed from the low-field susceptibility, ⌬M plots and the time dependence of thermoremanence, indicating that demagnetizing interactions led to an enhancement of both the relaxation rate at low temperatures and the amount of the lowest energy barriers. It is thus suggested that care should be taken when analyzing thermoremanent data at low temperature, in order not to confuse these experimental findings with the signature of macroscopic quantum tunneling. ͓S0163-1829͑97͒04709-7͔

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Section: Magnetic Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interaction effects and energy barrier distribution on the magnetic relaxation of nanocrystalline hexagonal ferrites

1997

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“…Also they have been extensively used as permanent magnets and microwave devices because of their large intrinsic uniaxial anisotropy and their high coercivity (2). This kind of materials can be prepared using various techniques (3)(4)(5)(6)(7)(8)(9)(10). The technique of preparation determines the magnetic properties of the samples and therefore discrepancies have been observed in the valúes of the magnetic parameters when different preparation techniques are used (11).…”

Section: Introductionmentioning

confidence: 99%

Structural and magnetic characterization of (Ba,Sr)-hexaferrite Powders

Palomares-Sánchez¹,

Ponce-Castañeda²,

Ruíz³

et al. 1999

REVMETAL

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Results on magnetic and structural characterization of ferrimagnetic compounds of Ba x Srj. x Fei 2 0i9 (x=0.0, 0.25, 0.50, 0.75 and 1.0) prepared by the conventional ceramic method are reported. The samples were systematically examined using atomic forcé microscopy (AFM), X-ray diffraction and vibrating sample magnetometer. Structural and magnetic differences among the specimens were observed. The relations between structural features and magnetic properties are discussed. The presintering temperatures of the samples were 800°C and 1,000°C. The specimens were sintered at 1,200°C for one hour.Keywords: Ferrites. Ceramics. Magnetic properties. Atomic forcé microscopy.Caracterización magnética y estructural de hexaferritas de (Ba,Sr)Resumen Se presentan resultados de la caracterización estructural y magnética de compuestos ferrimagnéticos Ba x Srj_ x Fe 12 0 19 (x=0,0, 0,25, 0,50, 0,75 y 1,0) preparados por el método cerámico convencional. Las muestras fueron examinadas por microscopía de fuerza atómica, difracción de rayos X y magnetometría de muestra vibrante. Se observaron diferencias tanto estructurales como magnéticas en las muestras analizadas. Se discuten las relaciones entre los aspectos estructurales y los parámetros magnéticos medidos. Las temperaturas de presinterización de las muestras fueron de 800°C y 1.000 °C y fueron sinterizadas a 1.200 °C durante una hora.Palabras clave: Ferritas. Cerámicos. Propiedades magnéticas. Microscopía de fuerza atómica.

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“…It is known that high coercivities require ne structures, with a particle size signicantly * corresponding author; e-mail: gsadullahoglu@beun.edu.tr small about 1 µm. There are several techniqes to produce ne particle barium hexaferrites, which are coprecipitation [8] glass crystallization [9], mechanochemical activation [10] and mechanical alloying [11,12]. Highenergy mechanical milling (mechanical alloying) is a simple technique used to obtain high coercive hexaferrites associated with ne microstructure.…”

mentioning

confidence: 99%

The Effect of Milling Time and Sintering Temperature on Crystallization of BaFe₁₂O₁₉Phase and Magnetic Properties of Ba-Hexaferrite Magnet

et al. 2015

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Barium hexaferrite samples were prepared by mechanical alloying using the stoichiometric amounts of BaCO3 and Fe2O3 precursors followed by heat treatment applied in the temperature range 7001150• C. It was found that the high energy ball mill with a milling rate enabled to obtain powders with the ner particles at the reduced milling time mechanical alloying of the initial powders linked to the formation of barium hexaferrite phase. The exothermic reaction peaks corresponding to the formation of BaFe12O19 phase shift from 928• C to 793•

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Magnetic properties of barium hexaferrite powders

Cited by 41 publications

References 15 publications

Interaction effects and energy barrier distribution on the magnetic relaxation of nanocrystalline hexagonal ferrites

Interaction effects and energy barrier distribution on the magnetic relaxation of nanocrystalline hexagonal ferrites

Structural and magnetic characterization of (Ba,Sr)-hexaferrite Powders

The Effect of Milling Time and Sintering Temperature on Crystallization of BaFe₁₂O₁₉Phase and Magnetic Properties of Ba-Hexaferrite Magnet

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Magnetic properties of barium hexaferrite powders

Cited by 41 publications

References 15 publications

Interaction effects and energy barrier distribution on the magnetic relaxation of nanocrystalline hexagonal ferrites

Interaction effects and energy barrier distribution on the magnetic relaxation of nanocrystalline hexagonal ferrites

Structural and magnetic characterization of (Ba,Sr)-hexaferrite Powders

The Effect of Milling Time and Sintering Temperature on Crystallization of BaFe12O19Phase and Magnetic Properties of Ba-Hexaferrite Magnet

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The Effect of Milling Time and Sintering Temperature on Crystallization of BaFe₁₂O₁₉Phase and Magnetic Properties of Ba-Hexaferrite Magnet